The Lipid Flippases ALA4 and ALA5 Play Critical Roles in Cell Expansion and Plant Growth.

Aminophospholipid ATPases (ALAs) are lipid flippases involved in transporting specific lipids across membrane bilayers. Arabidopsis () contains 12 ALAs in five phylogenetic clusters, including four in cluster 3 (ALA4-ALA7). / and /, are expressed primarily in vegetative tissues and pollen, respectively.